Table 21: Condenser – standard blower motor and drive data
Motor
Adjustable motor pulley
Fixed blower pulley
Model
Drive range (RPM)
HP
Frame size
Pitch diameter (inches)
Pitch diameter
(inches)
DSV060C
568–852
1.5
145
1.9–2.9
6.9
DSV096C
486–729
2
145
1.9–2.9
7.2
DSV120C
640–854
3
184
2.8–3.8
8.2
DSV144C
571–761
3
184
2.8–3.8
9.2
DSV180C
524–661
5
184
3.4–4.4
12.7
DSV240C
734–922
7.5
213
4.8–5.2
11.2
DSV300C
741–894
10
215
5.8–7.0
13.7
Table 22: Condenser – oversized blower motor and drive data
Motor
Adjustable motor pulley
Fixed blower pulley
Model
Drive range (RPM)
HP
Frame size
Pitch diameter (inches)
Pitch diameter
(inches)
DSV060C
677–1015
1.5
145
1.9–2.9
5.2
DSV096C
648–972
2
145
1.9–2.9
5.4
DSV120C
761–1014
3
184
2.8–3.8
6.9
DSV144C
682–909
3
184
2.8–3.8
7.7
DSV180C
621–785
5
184
3.4–4.4
10.4
DSV240C
848–1064
7.5
213
4.8–5.2
9.7
DSV300C
854–1020
10
215
6.2–7.4
12.7
Blower speed adjustment
Adjust the blower speed to increase or decrease the unit CFM for both VFD and non-VFD. The
RPM of the supply air (SA) and condenser air blowers depends on the required CFM and the static
resistances of both the supply/discharge and the return/intake duct systems. For units with VFD,
perform the required static and drive setup at the 100% fan speed condition.
Perform an air balance after installation to verify the airflow and static. This may require
adjustments to the drive. Refer to the Variable Frequency Drive manual (
Form 145.13-NO2
). Only
operate the unit in the regions defined by the fan tables. The units can be ordered with oversized
motors or drive kits for high static requirements.
Note:
Units with oversized motors or oversized drive kits are designed to operate in the
shaded region of the fan table otherwise motor amp draw will exceed overload setting
resulting in overload trips and possible damage to unit. Refer to fan tables for recommended
operating range of standard and oversized motors and drive kits.
Adjusting the blower speed
Determine the RPM for the blowers from
. To adjust the blower speed, take the
following steps:
1. Loosen the belt tension by moving the motor towards the blower shaft via the adjustable
mounting.
2. Loosen the setscrew in the adjustable motor pulley flange.
3. Remove the external key on the pulleys 4 inches diameter and larger.
4. Open or close the pulley an appropriate number of turns.
The blower speed increases when the moveable flange is adjusted towards the fixed flange
(closed). The blower speed decreases when the moveable flange is adjusted away from the
fixed flange (opened).
D-Series Vertical (DSV060C-300C) Air-Cooled Self-Contained Units, C Generation with Smart Equipment Controller
36
Johnson Controls
